Hmmm... I tried what you did, Matt. I exported mu(E) from Athena for both data groups and then did the e0 determination by hand. This happened: Ifeffit> read_data (gadowee.xmu, group=gad, type=xmu) Ifeffit> pre_edge(gad.energy, gad.xmu, find_e0=1) Ifeffit> print e0 10372.5980 Ifeffit> read_data (gam.xmu, group=gam, type=xmu) Ifeffit> pre_edge(gam.energy, gam.xmu, find_e0=1) Ifeffit> print e0 10374.0900 The first e0 value is different from the one you just reported and the same as Athena tells me. And I did not get the "out of order" message. I'm confused.
PS: Whether the max of the 1st derivative is a measure of the Fermi energy is a whole other story.
And how! B -- Bruce Ravel ----------------------------------- ravel@phys.washington.edu Code 6134, Building 3, Room 405 Naval Research Laboratory phone: (1) 202 767 2268 Washington DC 20375, USA fax: (1) 202 767 4642 NRL Synchrotron Radiation Consortium (NRL-SRC) Beamlines X11a, X11b, X23b National Synchrotron Light Source Brookhaven National Laboratory, Upton, NY 11973 My homepage: http://feff.phys.washington.edu/~ravel EXAFS software: http://feff.phys.washington.edu/~ravel/software/exafs/